Styles and Selectors let you adjust your site's look and feel in detail. Use selectors to assign a style to specific parts of a module. Selectors apply to all nested modules.
The selector gives you different options depending on which module you use it on. For example, assign a selector to your navigation and choose “active navigation link” from the settings.
If you drag a style into that selector now, it will only apply to the navigation link that's currently active. Now, you can use a font style to change the active link's colour.
Use styles to define the look of your site and selectors to design specific parts of your modules. Use infinite combinations of styles, selectors and modules to make your website stand out.